June 5, 2015 6:55 am Warm Weekend & Sierra Thunderstorms Meteorologist Kari Hall details your Friday Bay Area forecast, which includes a warming trend for the Bay & thunderstorms for the Sierra. US & World Videos 2:42 Forecast: Warm day, Saturday rain 1:43 Kari's forecast: Warm day, Saturday rain 2:04 Jeff's Forecast: Weekend rain update 3:51 Jeff's Forecast: Heat to fade as weekend rain is on the way 2:23 Forecast: Warm and windy day